In a perfect world, lead-acid batteries (both flooded and AGM) would be discharged no further than 50% then [[electrical:​12v:​charging|fully charged]] again((ie, to 100% State of Charge)) each day.

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In a perfect world, lead-acid batteries (both flooded and AGM) would be discharged no further than 20% then [[electrical:​12v:​charging|fully charged]] again((ie, to 100% State of Charge)) each day. In some studies this 20% depletion yields the most Ah/$. The downside is carrying around a lot of "dead lead", capacity that is never used.

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In actual usage it is more common to discharge to 50% SoC. This allows 2.5x the power to be used overnight at the cost of longevity.

It is easier to get the batteries fullly charged each day when [[electrical:​solar:​overpaneling#​vs_battery_bank|they are overpaneled]],​ but that trades battery health for less reserve for [[electrical:​solar:​output#​insolation|days of poor insolation]].

It is easier to get the batteries fullly charged each day when [[electrical:​solar:​overpaneling#​vs_battery_bank|they are overpaneled]],​ but that trades battery health for less reserve for [[electrical:​solar:​output#​insolation|days of poor insolation]].